Rainbow cup (German: Regenbogenschüsselchen, Czech: duhovka from duha - rainbow) is a term for Celtic gold and silver coins found in areas once dominated by the La Tène culture (c. 5th century BCE - 1st century BCE in central Europe). They are curved like a bowl and marked with various symbols and patterns.
The coins were often found in ploughed fields after heavy rainfall, leading to the folk belief that they could be found where a rainbow touched the earth. They were thought to bring luck and had many different effects ascribed to them.
- Rudd, Chris (6 September 2010). "Coin of the week (Rainbow cup)". Celticcoins.com. Retrieved 11 February 2013.
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